diff --git a/.circleci/config.yml b/.circleci/config.yml
index cc1a202..89daf6e 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -8,11 +8,11 @@ jobs:
       - run:
           name: Download and Install Terraform
           command: |
-            wget -O terraform.zip https://releases.hashicorp.com/terraform/0.11.7/terraform_0.11.7_linux_amd64.zip
+            wget -O terraform.zip https://releases.hashicorp.com/terraform/0.12.0/terraform_0.12.0_linux_amd64.zip
             unzip terraform.zip
             sudo mv terraform /usr/local/bin/terraform
 
-      - run: for dir in $(find . -name \*.tf -exec dirname {} \; | sort | uniq); do echo ${dir} && terraform validate -check-variables=false ${dir}; done
+      - run: for dir in $(find . -name \*.tf -exec dirname {} \; | sort | uniq); do echo ${dir} && terraform init ${dir} && terraform validate ${dir}; done
       - run: terraform fmt -check
 
   hold:
diff --git a/Terraform/locals.tf b/Terraform/locals.tf
index 9e99bfd..0a65dd9 100644
--- a/Terraform/locals.tf
+++ b/Terraform/locals.tf
@@ -3,3 +3,4 @@ locals {
   splunk_url = "https://${aws_instance.logger.public_ip}:8000"
   ata_url    = "https://${aws_instance.wef.public_ip}"
 }
+
diff --git a/Terraform/main.tf b/Terraform/main.tf
index 1054f3a..d5717d5 100644
--- a/Terraform/main.tf
+++ b/Terraform/main.tf
@@ -1,8 +1,8 @@
 # Specify the provider and access details
 provider "aws" {
-  shared_credentials_file = "${var.shared_credentials_file}"
-  region                  = "${var.region}"
-  profile                 = "${var.profile}"
+  shared_credentials_file = var.shared_credentials_file
+  region                  = var.region
+  profile                 = var.profile
 }
 
 # Create a VPC to launch our instances into
@@ -12,48 +12,48 @@ resource "aws_vpc" "default" {
 
 # Create an internet gateway to give our subnet access to the outside world
 resource "aws_internet_gateway" "default" {
-  vpc_id = "${aws_vpc.default.id}"
+  vpc_id = aws_vpc.default.id
 }
 
 # Grant the VPC internet access on its main route table
 resource "aws_route" "internet_access" {
-  route_table_id         = "${aws_vpc.default.main_route_table_id}"
+  route_table_id         = aws_vpc.default.main_route_table_id
   destination_cidr_block = "0.0.0.0/0"
-  gateway_id             = "${aws_internet_gateway.default.id}"
+  gateway_id             = aws_internet_gateway.default.id
 }
 
 # Create a subnet to launch our instances into
 resource "aws_subnet" "default" {
-  vpc_id                  = "${aws_vpc.default.id}"
+  vpc_id                  = aws_vpc.default.id
   cidr_block              = "192.168.38.0/24"
-  availability_zone       = "${var.availability_zone}"
+  availability_zone       = var.availability_zone
   map_public_ip_on_launch = true
 }
 
 # Adjust VPC DNS settings to not conflict with lab
 resource "aws_vpc_dhcp_options" "default" {
   domain_name          = "windomain.local"
-  domain_name_servers  = ["${aws_instance.dc.private_ip}", "${var.external_dns_servers}"]
-  netbios_name_servers = ["${aws_instance.dc.private_ip}"]
+  domain_name_servers  = [aws_instance.dc.private_ip, var.external_dns_servers]
+  netbios_name_servers = [aws_instance.dc.private_ip]
 }
 
 resource "aws_vpc_dhcp_options_association" "default" {
-  vpc_id          = "${aws_vpc.default.id}"
-  dhcp_options_id = "${aws_vpc_dhcp_options.default.id}"
+  vpc_id          = aws_vpc.default.id
+  dhcp_options_id = aws_vpc_dhcp_options.default.id
 }
 
 # Our default security group for the logger host
 resource "aws_security_group" "logger" {
   name        = "logger_security_group"
   description = "DetectionLab: Security Group for the logger host"
-  vpc_id      = "${aws_vpc.default.id}"
+  vpc_id      = aws_vpc.default.id
 
   # SSH access
   ingress {
     from_port   = 22
     to_port     = 22
     protocol    = "tcp"
-    cidr_blocks = "${var.ip_whitelist}"
+    cidr_blocks = var.ip_whitelist
   }
 
   # Splunk access
@@ -61,7 +61,7 @@ resource "aws_security_group" "logger" {
     from_port   = 8000
     to_port     = 8000
     protocol    = "tcp"
-    cidr_blocks = "${var.ip_whitelist}"
+    cidr_blocks = var.ip_whitelist
   }
 
   # Fleet access
@@ -69,7 +69,7 @@ resource "aws_security_group" "logger" {
     from_port   = 8412
     to_port     = 8412
     protocol    = "tcp"
-    cidr_blocks = "${var.ip_whitelist}"
+    cidr_blocks = var.ip_whitelist
   }
 
   # Allow all traffic from the private subnet
@@ -92,14 +92,14 @@ resource "aws_security_group" "logger" {
 resource "aws_security_group" "windows" {
   name        = "windows_security_group"
   description = "DetectionLab: Security group for the Windows hosts"
-  vpc_id      = "${aws_vpc.default.id}"
+  vpc_id      = aws_vpc.default.id
 
   # RDP
   ingress {
     from_port   = 3389
     to_port     = 3389
     protocol    = "tcp"
-    cidr_blocks = "${var.ip_whitelist}"
+    cidr_blocks = var.ip_whitelist
   }
 
   # WinRM
@@ -107,7 +107,7 @@ resource "aws_security_group" "windows" {
     from_port   = 5985
     to_port     = 5986
     protocol    = "tcp"
-    cidr_blocks = "${var.ip_whitelist}"
+    cidr_blocks = var.ip_whitelist
   }
 
   # Windows ATA
@@ -115,7 +115,7 @@ resource "aws_security_group" "windows" {
     from_port   = 443
     to_port     = 443
     protocol    = "tcp"
-    cidr_blocks = "${var.ip_whitelist}"
+    cidr_blocks = var.ip_whitelist
   }
 
   # Allow all traffic from the private subnet
@@ -136,23 +136,24 @@ resource "aws_security_group" "windows" {
 }
 
 resource "aws_key_pair" "auth" {
-  key_name   = "${var.public_key_name}"
-  public_key = "${file("${var.public_key_path}")}"
+  key_name   = var.public_key_name
+  public_key = file(var.public_key_path)
 }
 
 resource "aws_instance" "logger" {
   instance_type = "t2.medium"
-  ami           = "${coalesce(data.aws_ami.logger_ami.image_id, var.logger_ami)}"
+  ami           = coalesce(data.aws_ami.logger_ami.image_id, var.logger_ami)
 
-  tags {
+  tags = {
     Name = "logger"
   }
 
-  subnet_id              = "${aws_subnet.default.id}"
-  vpc_security_group_ids = ["${aws_security_group.logger.id}"]
-  key_name               = "${aws_key_pair.auth.key_name}"
+  subnet_id              = aws_subnet.default.id
+  vpc_security_group_ids = [aws_security_group.logger.id]
+  key_name               = aws_key_pair.auth.key_name
   private_ip             = "192.168.38.105"
 
+  # Provision the AWS Ubuntu 16.04 AMI from scratch.
   # Provision the AWS Ubuntu 16.04 AMI from scratch.
   provisioner "remote-exec" {
     inline = [
@@ -172,9 +173,10 @@ resource "aws_instance" "logger" {
     ]
 
     connection {
+      host        = coalesce(self.public_ip, self.private_ip)
       type        = "ssh"
       user        = "ubuntu"
-      private_key = "${file("${var.private_key_path}")}"
+      private_key = file(var.private_key_path)
     }
   }
 
@@ -188,14 +190,14 @@ resource "aws_instance" "dc" {
   instance_type = "t2.medium"
 
   # Uses the local variable if external data source resolution fails
-  ami = "${coalesce(data.aws_ami.dc_ami.image_id, var.dc_ami)}"
+  ami = coalesce(data.aws_ami.dc_ami.image_id, var.dc_ami)
 
-  tags {
+  tags = {
     Name = "dc.windomain.local"
   }
 
-  subnet_id              = "${aws_subnet.default.id}"
-  vpc_security_group_ids = ["${aws_security_group.windows.id}"]
+  subnet_id              = aws_subnet.default.id
+  vpc_security_group_ids = [aws_security_group.windows.id]
   private_ip             = "192.168.38.102"
 
   root_block_device {
@@ -207,14 +209,14 @@ resource "aws_instance" "wef" {
   instance_type = "t2.medium"
 
   # Uses the local variable if external data source resolution fails
-  ami = "${coalesce(data.aws_ami.wef_ami.image_id, var.wef_ami)}"
+  ami = coalesce(data.aws_ami.wef_ami.image_id, var.wef_ami)
 
-  tags {
+  tags = {
     Name = "wef.windomain.local"
   }
 
-  subnet_id              = "${aws_subnet.default.id}"
-  vpc_security_group_ids = ["${aws_security_group.windows.id}"]
+  subnet_id              = aws_subnet.default.id
+  vpc_security_group_ids = [aws_security_group.windows.id]
   private_ip             = "192.168.38.103"
 
   root_block_device {
@@ -226,17 +228,18 @@ resource "aws_instance" "win10" {
   instance_type = "t2.medium"
 
   # Uses the local variable if external data source resolution fails
-  ami = "${coalesce(data.aws_ami.win10_ami.image_id, var.win10_ami)}"
+  ami = coalesce(data.aws_ami.win10_ami.image_id, var.win10_ami)
 
-  tags {
+  tags = {
     Name = "win10.windomain.local"
   }
 
-  subnet_id              = "${aws_subnet.default.id}"
-  vpc_security_group_ids = ["${aws_security_group.windows.id}"]
+  subnet_id              = aws_subnet.default.id
+  vpc_security_group_ids = [aws_security_group.windows.id]
   private_ip             = "192.168.38.104"
 
   root_block_device {
     delete_on_termination = true
   }
 }
+
diff --git a/Terraform/outputs.tf b/Terraform/outputs.tf
index 30afa81..4447ac4 100644
--- a/Terraform/outputs.tf
+++ b/Terraform/outputs.tf
@@ -1,31 +1,32 @@
-output region {
-  value = "${var.region}"
+output "region" {
+  value = var.region
 }
 
 output "logger_public_ip" {
-  value = "${aws_instance.logger.public_ip}"
+  value = aws_instance.logger.public_ip
 }
 
 output "dc_public_ip" {
-  value = "${aws_instance.dc.public_ip}"
+  value = aws_instance.dc.public_ip
 }
 
 output "wef_public_ip" {
-  value = "${aws_instance.wef.public_ip}"
+  value = aws_instance.wef.public_ip
 }
 
 output "win10_public_ip" {
-  value = "${aws_instance.win10.public_ip}"
+  value = aws_instance.win10.public_ip
 }
 
 output "ata_url" {
-  value = "${local.ata_url}"
+  value = local.ata_url
 }
 
 output "fleet_url" {
-  value = "${local.fleet_url}"
+  value = local.fleet_url
 }
 
 output "splunk_url" {
-  value = "${local.splunk_url}"
+  value = local.splunk_url
 }
+
diff --git a/Terraform/variables.tf b/Terraform/variables.tf
index fda5ba1..2ddb0c9 100644
--- a/Terraform/variables.tf
+++ b/Terraform/variables.tf
@@ -13,7 +13,7 @@ variable "availability_zone" {
 
 variable "shared_credentials_file" {
   description = "Path to your AWS credentials file"
-  type        = "string"
+  type        = string
   default     = "/home/username/.aws/credentials"
 }
 
@@ -24,25 +24,25 @@ variable "public_key_name" {
 
 variable "public_key_path" {
   description = "Path to the public key to be loaded into the logger authorized_keys file"
-  type        = "string"
+  type        = string
   default     = "/home/username/.ssh/id_logger.pub"
 }
 
 variable "private_key_path" {
   description = "Path to the private key to use to authenticate to logger."
-  type        = "string"
+  type        = string
   default     = "/home/username/.ssh/id_logger"
 }
 
 variable "ip_whitelist" {
   description = "A list of CIDRs that will be allowed to access the EC2 instances"
-  type        = "list"
+  type        = list(string)
   default     = [""]
 }
 
 variable "external_dns_servers" {
   description = "Configure lab to allow external DNS resolution"
-  type        = "list"
+  type        = list(string)
   default     = ["8.8.8.8"]
 }
 
@@ -93,21 +93,22 @@ data "aws_ami" "win10_ami" {
 # The default values for us-west-1 have been provied for you
 # You will have to change the default values if you use a different region
 variable "logger_ami" {
-  type    = "string"
+  type    = string
   default = "ami-0ad16744583f21877"
 }
 
 variable "dc_ami" {
-  type    = "string"
+  type    = string
   default = "ami-03e2df055c632a0dd"
 }
 
 variable "wef_ami" {
-  type    = "string"
+  type    = string
   default = "ami-03c82482c03a740c5"
 }
 
 variable "win10_ami" {
-  type    = "string"
+  type    = string
   default = "ami-0a4644e74768900f7"
 }
+
diff --git a/Terraform/versions.tf b/Terraform/versions.tf
new file mode 100644
index 0000000..ac97c6a
--- /dev/null
+++ b/Terraform/versions.tf
@@ -0,0 +1,4 @@
+
+terraform {
+  required_version = ">= 0.12"
+}